TLDRVuln - Cybersecurity Vulnerabilities Made Simple

In the Linux kernel, the following vulnerability has been resolved:

s390/sclp: Fix sclp_init() cleanup on failure

If sclp_init() fails it only partially cleans up: if there are multiple

failing calls to sclp_init() sclp_state_change_event will be added several

times to sclp_reg_list, which results in the following warning:

------------[ cut here ]------------

list_add double add: new=000003ffe1598c10, prev=000003ffe1598bf0, next=000003ffe1598c10.

WARNING: CPU: 0 PID: 1 at lib/list_debug.c:35 __list_add_valid_or_report+0xde/0xf8

CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.10.0-rc3

Krnl PSW : 0404c00180000000 000003ffe0d6076a (__list_add_valid_or_report+0xe2/0xf8)

R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3

...

Call Trace:

[<000003ffe0d6076a>] __list_add_valid_or_report+0xe2/0xf8

([<000003ffe0d60766>] __list_add_valid_or_report+0xde/0xf8)

[<000003ffe0a8d37e>] sclp_init+0x40e/0x450

[<000003ffe00009f2>] do_one_initcall+0x42/0x1e0

[<000003ffe15b77a6>] do_initcalls+0x126/0x150

[<000003ffe15b7a0a>] kernel_init_freeable+0x1ba/0x1f8

[<000003ffe0d6650e>] kernel_init+0x2e/0x180

[<000003ffe000301c>] __ret_from_fork+0x3c/0x60

[<000003ffe0d759ca>] ret_from_fork+0xa/0x30

Fix this by removing sclp_state_change_event from sclp_reg_list when

sclp_init() fails.